Because Big Sister Says So!

Monitor



Marie really hadn’t needed to shower again. She needed only to clean Casey’s sex juices off her face and her own between her thighs. Nonetheless, she took Casey’s advice and took one.

Standing alone in the tub with the translucent sliding doors closed, the temptation grew to disobey Cathy and make herself come. She forced herself to suppress that urge. Not only did she now take pride in her obedience to her sister, but Casey would surely figure out what she did and had already promised to report her if she cheated. So far, Cathy’s tortures of her had proven mostly pleasant. She had no doubt, however, of her sister’s potential cruelty if angered, not to mentioned the damning photographs by which she had originally blackmailed Marie into sexual slavery.

Marie needed a distraction from her need to masturbate. At least she needed someone to stop her if she started. She called over the doors to Casey. “If you want to join me, I’ll scrub your back.”


 
"If you want to join me," Marie told Casey from the shower. "I'll scrub your back."

She did not need to ask twice. Already nude, Casey stepped into the the tub and kissed her sister with unabashed passion. She loved the sensation of her larger breasts brushing against Marie's smaller but more pert ones.

"Just don't start anything," Casey warned when they broke their prolonged kiss. "You know what Mistress said. We're not allowed to come."
 
Oh, the Pain!



“You know what Mistress said,” Casey reminded Marie after they kissed. “We’re not allowed to come.”

Marie actually groaned with sexual frustration. Her nipples had grown so stiff and erect that they felt like points of fire. She could feel the juices seeping from her throbbing vagina.

“I... I know,” she sobbed. “Turn around, Love... I’ll scrub your back.”


 
Cathy had all the ingredients for dinner prepared, the salmon seasoned, the spinach washed, the rice measured. She would wait to start them all to cooking at just a few minutes before six o'clock, at which time Dawn would arrive, if she didn't chicken out. On her way to the bedrooms to dress, she passed Gus sleeping on the living room couch.

"Sleep well, my delicious Slave," she whispered as she entered the hallway. "You'll need all your strength tonight!"
 
"Turn around, Love," Marie suggested as their lips parted from a sweet, sensual kiss. "I'll scrub your back."

Casey could hear the sexual desire and emotional yearning in her sister's voice. She felt sympathy and, having herself often suffered from Cathy's delight in orgasm denial, empathy, but no guilt. Cathy had instructed her to accept oral sex from Marie, but not respond in kind. She had simply obeyed orders.

She turned her back hoping, for Marie's sake, that whatever surprise Cathy had planned for tonight would fully compensate Marie for her current misery.
 
Willpower



Marie focused on the plain, smooth skin between Casey’s shoulder blades as she used a luffa to spread soapy lather across her back. She tried to keep her mind off her sister’s lovely full breasts and tight, blonde womanhood. She could hardly resist seizing Casey’s arms and spinning her back to kiss again. Marie desperately wanted to trib with Casey until they both came.

Having fully soaped Casey’s lean back and firm buttocks, Marie reached around and dangled the luffa in front of her. Marie’s voice cracked with lust when she spoke. “You had better do the rest of your body. I don’t trust myself.”


 
Dawn parked her yellow VW Beetle in front of the house where she still lived with her divorced mother and younger sister. She hurried up the concrete walk and through the front door. She happened to pass her sister --- a tomboy named Colleen, but universally known as "George," after George of the Jungle --- at the top of the stairs.

"How was work?"

"It was..." Dawn stopped for a moment and thought. Already a few steps down the hall from George, her sister didn't see the quirky smile that suddenly graced Dawn's face. "It was... interesting...."

Without further explanation, Dawn turned into her bedroom, closed the door, and started to undress. That private act got her thinking. Given what she had seen at the restaurant, it seemed almost certain Cathy had invited her over for some sort of sexual adventure. She had accepted almost on a whim, out of nostalgia for when she, not Marie, had Gus's heart.

She thought of the tags on Marie and Casey's collars, "Lesbian Slut" and "Eager Sex Slave," respectively. Dawn considered the implications. Did she really want to lose her virginity under such circumstances?

The thought of losing it to Gus, as she had always dreamed, made her nipples tingly erect and her vulva dampen. Instinctively, she moved to retrieve the vibrator hidden in the back of one of her top dresser drawers. She had convinced her oldest sister Denise to buy it for her over a year earlier, after Gus had broken things off and started seeing Marie. Countless times, she had used it to fantasize giving her virginity to Gus....

Now, unexpectedly, almost impossibly, the chance had come to bring that fantasy to reality. Regardless of the surrounding circumstances, if she did not seize this opportunity, she knew she would regret it forever. She left the vibrator in its hiding place and went to take a shower. She needed to hurry to get to dinner with Gus, Cathy, and her sisters by six o'clock.
 
Having Marie scrub her back, then herself lathering and rinsing the rest of her body, especially her breasts and private parts, had Casey quite horny again. Always mischievous, lust often made Casey a tad bit sadistic. She turned away from the warm spraying water to face Marie, who watched her with obvious love and desire.

"Now let me scrub your back," Casey purred.
 
Tempting Fate



Forbidden to reach orgasm and already virulently horny, Marie worried how having Casey even simply scrub her back might affect her. She could not, however, resist the desire for even this mild stimulus. With a ragged resigned sigh, she turned her back to her sister. Marie pressed the palms of her hands tight against the outsides of her thighs. She knew it would take all her willpower not to touch herself while her sister stroked her back.

 
Ideally, scrubbing someone's back relaxes her. Casey noticed the ongoing tension in Marie's muscles, and understood its source. Their older sister and Mistress Cathy had forbidden Marie to orgasm, then put her in a series of erotic situations. Cathy had tortured Casey similarly in the past. She knew Marie's torment.

The thought of her until recently innocent sister in this situation excited Casey. Having finished her back, Casey set the luffa aside and reached around Marie to cup her pert, medium-sized breasts. Though small, Marie's nipples became longer and very stiff when excited, like now. Casey began flicking her thumbs back and forth over them while gently squeezing the firm breasts.
 
Sweet Torment



“OH! God...” Marie groaned when Casey cupped her breasts and stroked her stiff nipples. Already unbearably horny, but forbidden to have an orgasm, her sister’s erogenous caresses tormented her almost beyond sane tolerance. Marie next whimpered. “No... please....”

She did nothing, however, to interfere with Casey’s pleasuring hands. Instead, she leaned back against her sister, relishing the feeling of Casey’s large wet breasts pressed against her warm skin. The back of Marie’s head came to rest on Casey’s left shoulder.

Please Casey... I need you so badly!”

 
Casey filled her hands with lather from a cake of Dove bath bar and started spreading it up Marie's arms as her sister leaned back against her.

"Please Casey..." Marie pleaded "I need you so badly!"

"I know, Darling," Casey whispered seductively into her ear as her soapy hands returned to Marie's pert breasts, her hardened nipples pressing into Casey's palms. "But you know you're not allowed to come, even if I do this...."

Leaving her left hand to massage Marie's breasts, Casey moved her right hand down between her sister's thighs to cup and gently caress her womanhood, her middle finger parting the labia to dip into the hot juices within.
 
Losing Control



“No!” Marie gasped as Casey’s middle finger parted her slick folds. “Please no... not if your not going....”

Her plaintive whimper degenerated into a desperate growl as her hips bucked spontaneously, trying to force contact between her clitoris and Casey’s finger. Consciously, Marie knew Casey would not let her come, and that they’d both face dreadful consequences if she did, but her body didn’t care. Her lust had reached an excruciating degree. Even her mouth betrayed her.

“Oh God Casey! Please... PLEASE make me come!!!”

 
Cathy had just entered the bedroom hallway when she heard Marie's desperate cry from the main bathroom.

"Casey, please... PLEASE make me come!!!"

"Oh no you don't!" Cathy growled as she stormed into the bathroom. She could see her sisters' naked forms cuddling together behind the translucent shower doors. The sound of the water had muffled her entrance, so she raised her voice.

"Alright you two sluts... Get out here right now!"
 
"Alright you two sluts," Cathy's voice made Casey tangibly flinch. "Get out here right now!"

"Fuck!" Casey gasped softly, but her voice still carried a tinge of fear. She gently pushed Marie away, then opened the shower door, stepped out of the tub, and knelt on the tile floor in front of Cathy. Suds transferred from Marie's lathered body dripped off Casey's full breasts and down her flat tummy. "I'm sorry, Mistress. I... I wasn't going to let her come."
 
Confession



“Fuck!” Casey grunted into Marie’s ear, pushed her gently away, then got out of the shower. Marie heard her apologize to Cathy. “I’m sorry, Mistress. I... I wasn’t going to let her come.”

Without taking the time to rinse the lather off her body, Marie followed her younger sister out of the tub and knelt beside her.

“Don’t blame Casey,” Marie pleaded. “I’m the weak one.... I wanted her to touch me....”

 
Cathy smiled down at her slaves. She actually appreciated the way Casey had exacerbated Maries' lust, and the girls had not actually disobeyed her.

"Well, okay," she sneered. "I guess there was no harm done. Now rinse off and get dressed. Our guest will be here soon."

Without another word she turned away and went to the master bedroom to get herself ready.
 
Casey rinsed off first, then remained in the bathroom to ensure Marie didn't violate Cathy's command that she not have an orgasm. Casey had trouble resisting an urge to masturbate herself. Cathy's mention of a "guest" had her very excited. Knowing her oldest sister's creative approach to sex, Casey felt confident this new person would surely make this adventure all the more fun and satisfying.
 
Welcoming



Marie stood motionless in the shower, the water beating against the back of her head and running down the matted tresses of her thick brown hair.

Cathy had said: Our guest will be here soon. Guest?

Guest!

Marie felt trapped. She had already grown comfortable with practicing her newly discovered wantonness in front of her darling Gus and beloved sisters, all of whom she trusted utterly. On the other hand, she could not imagine doing so with anyone else, possibly, perhaps even probably, a stranger. She wondered what had inspired Cathy to risk upsetting the beautiful interconnected relationships she had created among the four of them by the inclusion of a fifth.

Hearing her own moan brought Marie from her reverie. She realized that, without realizing it, she had moved her hand to her own womanhood and softly stroked her clitoris. She yanked her fingers away, worried that she might suffer Cathy’s wrath for disobedience, and in horror that, despite her distress by the thought of having a guest here tonight, she felt no less horny than she had ten minutes earlier when ignorant of that plan.

Indeed, the realization of her helplessness to prevent Cathy from proceeding to expose and use her in any way she saw fit sent a thrill down Marie’s spine to further fuel her now incessant lust. Marie moaned again, not from any self-gratification but from the terrifying amazement that she found her abject enslavement to Cathy the sexiest thing that had ever happened to her. With this thought in mind, she rinsed the soap from her body and the tears of something not quite joy, but definitely not sorrow, from her face. Then she stepped out of the shower to where Casey waited for her. She hugged her sister and started crying again.

 
"Don't cry, Sweetie!" Casey hugged Marie tightly and kissed her wet hair. "Don't worry about this 'guest.' Cathy would never do anything that would really harm us. Trust her to do right by us. Hasn't she so far?"
 
Emotions



“I know,” Marie nodded and sniffled against Casey neck. “That’s not why I’m crying.”

She gave her sister a quick tight hug then opened the distance between them. Still in each other’s arms, they now looked into each other’s sparkling blue eyes.

“I do trust Cathy,” she continued. “She has shown me so much love and... even better... shown me how best to show you how much I love you. It’s just so much emotion.... Now I guess she’s going to take it to another level.... I want that... I do.... I’m just a little overwhelmed.”



 
"I understand," Casey smiled and kissed her older sister. "But whoever this guest is... whatever Cathy has in mind... you can bet that, in the end, it will mean a lot of fun and pleasure. Now we had better go get ready."

Taking Marie's hand, she led her across the hall to the bedroom with their new outfits in it.
 
Dressing Down



“Why
these ugly things ?” Marie wondered aloud as she twisted at her narrow waist to clip a garter — the last of four, two per thigh — to the top of the stocking on her right leg. She next pulled on the short sleeved, knee length, waitress uniform. Its dull yellow color reminded her of infant diarrhea, little helped by its broad white lapels and cuffs. Even with the front open to reveal she wore only the garter belt and stockings underneath, she could not remember the last time she felt so unattractive. Certainly, she could think of a hundred ways to dress as Cathy’s enslaved servant sexier than this. She finished buttoning it up and turned to Casey, now identically dressed. “Well... I hate to ask but... how do I look?”



 
"You're always beautiful," Casey reassured Marie automatically but honestly. A thought had her distracted. She, too, wondered why Cathy had picked these ugly waitress uniforms for them to wear to entertain a guest. Had the sight of Gus's old girlfriend Dawn simply inspired her to humiliate her slaves with such clothing, or might the selection indicate the identity of the expected visitor? Would Cathy be that daring? And that cruel? Casey had to admit she probably could be both.

Trying to hide the concern in her eyes with a loving smile, she kissed Marie on the lips and caressed her cheek. "Now let's go make sure there is nothing more Cathy requires from us before our guest arrives."

Taking her older sister's hand, Casey headed toward the kitchen.
 
Cathy removed the tags from her new lingerie set, then began to put it on. She loved how wearing slinky underwear made her feel, and she sighed with lust as she thought of her devious intentions for this evening. Rolling a black stocking up her right leg, her left hand continued beyond its top, up the smooth skin of her exposed upper thigh, to gently caress herself though the thin black lace of the split crotch thong. She dipped her middle finger through the gap to tease herself further before stopping to repeat the process with the second stocking and her left leg. Her fingers trembled slightly with desire when she then fastened the garters to the stockings.

Her mounting excitement from this play had her nipples fully erect when she then pulled on her little black velvet dress. The open cup design of the bra let the dress's silky lining directly drag down across her sensitive nipples. She moaned softly with her need, intensified by the feeling of her nipples poking visibly against the front of the dress.

She glanced at the clock and saw that Dawn would arrive any minute now. This left insufficient time for Cathy to have Marie or Gus lick her to orgasm and momentarily quench the distracting fire in her loins. Cathy smiled coldly at that, knowing this not entirely unwelcome libidinousness would make what she planned for dinner all the more enjoyable. With that in mind, she stepped into her black stiletto heel pumps and hurried as best she could down the hall to seek out her slaves.
 
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